Patents by Inventor Hidekazu Kawatoko

Hidekazu Kawatoko has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Magnetic recording medium and method for manufacturing the same
    Patent number: 8613977
    Abstract: A method for manufacturing a magnetic recording medium of the present invention includes a magnetic layer forming step in which a drying process is performed. The drying process includes: a pre-heating stage in which a magnetic coating film is heated until the surface temperature of the magnetic coating film stops rising and reaches a substantially constant temperature; a constant rate drying stage that is performed after the pre-heating stage in which the surface temperature of the magnetic coating film is held substantially constant; and a falling rate drying stage that is performed after the constant rate drying stage in which the surface temperature of the magnetic coating film is increased to be higher than the surface temperature during the constant rate drying stage to harden the magnetic coating film. The constant rate drying period in which the constant rate drying stage is performed is 0.2 seconds or more.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: December 24, 2013
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Hisanobu Mikamo, Hidekazu Kawatoko, Makoto Shiokawa, Shinji Kawakami, Masanori Yamasaki, Hitoshi Tsukamoto, Sadamu Kuse
  • Magnetic recording medium and method for manufacturing the same
    Publication number: 20080070066
    Abstract: A method for manufacturing a magnetic recording medium of the present invention includes a magnetic layer forming step in which a drying process is performed. The drying process includes: a pre-heating stage in which a magnetic coating film is heated until the surface temperature of the magnetic coating film stops rising and reaches a substantially constant temperature; a constant rate drying stage that is performed after the pre-heating stage in which the surface temperature of the magnetic coating film is held substantially constant; and a falling rate drying stage that is performed after the constant rate drying stage in which the surface temperature of the magnetic coating film is increased to be higher than the surface temperature during the constant rate drying stage to harden the magnetic coating film. The constant rate drying period in which the constant rate drying stage is performed is 0.2 seconds or more.
    Type: Application
    Filed: September 14, 2007
    Publication date: March 20, 2008
    Inventors: Hisanobu Mikamo, Hidekazu Kawatoko, Makoto Shiokawa, Shinji Kawakami, Masanori Yamasaki, Hitoshi Tsukamoto, Sadamu Kuse